Zoloft Withdrawal: Sudden Highs and Irregular Sleep Patterns

I recently went off my 200 mg Zoloft that I was using to treat bad social anxiety and bad intermittent depression about 15 days ago. I stopped taking it because I was frustrated that I felt it was doing almost nothing to help me. After about five days of not taking it I suddenly felt on top of the world like I’ve never felt before. I was talking to people, I was excited, my mind was going a million miles and hour, I went on a spontaneous trip to the coast, and I’ve even discovered a major issue at my company that will save them thousands and thousands of dollars. I don’t think I could have done this if I wasn’t in this mental state. The problem is this is extremely out of the ordinary for me and I’ve been having very irregular sleep patterns, some nights only four hours of sleep and yet I feel great. Has anyone experienced this and I’m I headed for an inevitable crash?